projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4ca9bc22 MCC |
1 | ========================================= |
| 2 | The TCM v4 fabric module script generator | |
| 3 | ========================================= | |
| 4 | ||
| 5 | Greetings all, | |
| 6 | ||
| 7 | This document is intended to be a mini-HOWTO for using the tcm_mod_builder.py | |
| 8 | script to generate a brand new functional TCM v4 fabric .ko module of your very own, | |
| 9 | that once built can be immediately be loaded to start access the new TCM/ConfigFS | |
| 10 | fabric skeleton, by simply using:: | |
| 11 | ||
| 12 | modprobe $TCM_NEW_MOD | |
| 13 | mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD | |
| 14 | ||
| 15 | This script will create a new drivers/target/$TCM_NEW_MOD/, and will do the following | |
| 16 | ||
| 17 | 1) Generate new API callers for drivers/target/target_core_fabric_configs.c logic | |
| 18 | ->make_tpg(), ->drop_tpg(), ->make_wwn(), ->drop_wwn(). These are created | |
| 19 | into $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c | |
| 20 | 2) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module | |
| 21 | using a skeleton struct target_core_fabric_ops API template. | |
| 22 | 3) Based on user defined T10 Proto_Ident for the new fabric module being built, | |
| 23 | the TransportID / Initiator and Target WWPN related handlers for | |
| 24 | SPC-3 persistent reservation are automatically generated in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c | |
| 25 | using drivers/target/target_core_fabric_lib.c logic. | |
| 26 | 4) NOP API calls for all other Data I/O path and fabric dependent attribute logic | |
| 27 | in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c | |
| 28 | ||
| 29 | tcm_mod_builder.py depends upon the mandatory '-p $PROTO_IDENT' and '-m | |
| 30 | $FABRIC_MOD_name' parameters, and actually running the script looks like:: | |
| 31 | ||
| 32 | target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000 | |
| 33 | tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../ | |
| 34 | Set fabric_mod_name: tcm_nab5000 | |
| 35 | Set fabric_mod_dir: | |
| 36 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000 | |
| 37 | Using proto_ident: iSCSI | |
| 38 | Creating fabric_mod_dir: | |
| 39 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000 | |
| 40 | Writing file: | |
| 41 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h | |
| 42 | Using tcm_mod_scan_fabric_ops: | |
| 43 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h | |
| 44 | Writing file: | |
| 45 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c | |
| 46 | Writing file: | |
| 47 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h | |
| 48 | Writing file: | |
| 49 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c | |
| 50 | Writing file: | |
| 51 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild | |
| 52 | Writing file: | |
| 53 | /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig | |
| 54 | Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes | |
| 55 | Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes | |
| 56 | ||
| 57 | At the end of tcm_mod_builder.py. the script will ask to add the following | |
| 58 | line to drivers/target/Kbuild:: | |
| 59 | ||
| 60 | obj-$(CONFIG_TCM_NAB5000) += tcm_nab5000/ | |
| 61 | ||
| 62 | and the same for drivers/target/Kconfig:: | |
| 63 | ||
| 64 | source "drivers/target/tcm_nab5000/Kconfig" | |
| 65 | ||
| 66 | #) Run 'make menuconfig' and select the new CONFIG_TCM_NAB5000 item:: | |
| 67 | ||
| 68 | <M> TCM_NAB5000 fabric module | |
| 69 | ||
| 70 | #) Build using 'make modules', once completed you will have:: | |
| 71 | ||
| 72 | target:/mnt/sdb/lio-core-2.6.git# ls -la drivers/target/tcm_nab5000/ | |
| 73 | total 1348 | |
| 74 | drwxr-xr-x 2 root root 4096 2010-10-05 03:23 . | |
| 75 | drwxr-xr-x 9 root root 4096 2010-10-05 03:22 .. | |
| 76 | -rw-r--r-- 1 root root 282 2010-10-05 03:22 Kbuild | |
| 77 | -rw-r--r-- 1 root root 171 2010-10-05 03:22 Kconfig | |
| 78 | -rw-r--r-- 1 root root 49 2010-10-05 03:23 modules.order | |
| 79 | -rw-r--r-- 1 root root 738 2010-10-05 03:22 tcm_nab5000_base.h | |
| 80 | -rw-r--r-- 1 root root 9096 2010-10-05 03:22 tcm_nab5000_configfs.c | |
| 81 | -rw-r--r-- 1 root root 191200 2010-10-05 03:23 tcm_nab5000_configfs.o | |
| 82 | -rw-r--r-- 1 root root 40504 2010-10-05 03:23 .tcm_nab5000_configfs.o.cmd | |
| 83 | -rw-r--r-- 1 root root 5414 2010-10-05 03:22 tcm_nab5000_fabric.c | |
| 84 | -rw-r--r-- 1 root root 2016 2010-10-05 03:22 tcm_nab5000_fabric.h | |
| 85 | -rw-r--r-- 1 root root 190932 2010-10-05 03:23 tcm_nab5000_fabric.o | |
| 86 | -rw-r--r-- 1 root root 40713 2010-10-05 03:23 .tcm_nab5000_fabric.o.cmd | |
| 87 | -rw-r--r-- 1 root root 401861 2010-10-05 03:23 tcm_nab5000.ko | |
| 88 | -rw-r--r-- 1 root root 265 2010-10-05 03:23 .tcm_nab5000.ko.cmd | |
| 89 | -rw-r--r-- 1 root root 459 2010-10-05 03:23 tcm_nab5000.mod.c | |
| 90 | -rw-r--r-- 1 root root 23896 2010-10-05 03:23 tcm_nab5000.mod.o | |
| 91 | -rw-r--r-- 1 root root 22655 2010-10-05 03:23 .tcm_nab5000.mod.o.cmd | |
| 92 | -rw-r--r-- 1 root root 379022 2010-10-05 03:23 tcm_nab5000.o | |
| 93 | -rw-r--r-- 1 root root 211 2010-10-05 03:23 .tcm_nab5000.o.cmd | |
| 94 | ||
| 95 | #) Load the new module, create a lun_0 configfs group, and add new TCM Core | |
| 96 | IBLOCK backstore symlink to port:: | |
| 97 | ||
| 98 | target:/mnt/sdb/lio-core-2.6.git# insmod drivers/target/tcm_nab5000.ko | |
| 99 | target:/mnt/sdb/lio-core-2.6.git# mkdir -p /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0 | |
| 100 | target:/mnt/sdb/lio-core-2.6.git# cd /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0/ | |
| 101 | target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# ln -s /sys/kernel/config/target/core/iblock_0/lvm_test0 nab5000_port | |
| 102 | ||
| 103 | target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# cd - | |
| 104 | target:/mnt/sdb/lio-core-2.6.git# tree /sys/kernel/config/target/nab5000/ | |
| 105 | /sys/kernel/config/target/nab5000/ | |
| 106 | |-- discovery_auth | |
| 107 | |-- iqn.foo | |
| 108 | | `-- tpgt_1 | |
| 109 | | |-- acls | |
| 110 | | |-- attrib | |
| 111 | | |-- lun | |
| 112 | | | `-- lun_0 | |
| 113 | | | |-- alua_tg_pt_gp | |
| 114 | | | |-- alua_tg_pt_offline | |
| 115 | | | |-- alua_tg_pt_status | |
| 116 | | | |-- alua_tg_pt_write_md | |
| 117 | | | `-- nab5000_port -> ../../../../../../target/core/iblock_0/lvm_test0 | |
| 118 | | |-- np | |
| 119 | | `-- param | |
| 120 | `-- version | |
| 121 | ||
| 122 | target:/mnt/sdb/lio-core-2.6.git# lsmod | |
| 123 | Module Size Used by | |
| 124 | tcm_nab5000 3935 4 | |
| 125 | iscsi_target_mod 193211 0 | |
| 126 | target_core_stgt 8090 0 | |
| 127 | target_core_pscsi 11122 1 | |
| 128 | target_core_file 9172 2 | |
| 129 | target_core_iblock 9280 1 | |
| 130 | target_core_mod 228575 31 | |
| 131 | tcm_nab5000,iscsi_target_mod,target_core_stgt,target_core_pscsi,target_core_file,target_core_iblock | |
| 132 | libfc 73681 0 | |
| 133 | scsi_debug 56265 0 | |
| 134 | scsi_tgt 8666 1 target_core_stgt | |
| 135 | configfs 20644 2 target_core_mod | |
| 136 | ||
| 137 | ---------------------------------------------------------------------- | |
| 138 | ||
| 139 | Future TODO items | |
| 140 | ================= | |
| 141 | ||
| 142 | 1) Add more T10 proto_idents | |
| 143 | 2) Make tcm_mod_dump_fabric_ops() smarter and generate function pointer | |
| 144 | defs directly from include/target/target_core_fabric_ops.h:struct target_core_fabric_ops | |
| 145 | structure members. | |
| 146 | ||
| 147 | October 5th, 2010 | |
| 148 | ||
| 149 | Nicholas A. Bellinger <nab@linux-iscsi.org> |